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6 Feb 2012

Volume 100, Issue 6, Articles (06xxxx)

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Appl. Phys. Lett. 100, 061101 (2012); http://dx.doi.org/10.1063/1.3665180 (3 pages)

I. E. Khodasevych, C. M. Shah, S. Sriram, M. Bhaskaran, W. Withayachumnankul, B. S. Y. Ung, H. Lin, W. S. T. Rowe, D. Abbott, and A. Mitchell
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Use of the radiofrequency-intermodulation distortion technique to investigate intrinsic nonlinearity at the electrode-electrolyte interface

Rohit Pande, Leiming Xie, Wanda Zagozdzon-Wosik, Krzysztof Nesteruk, and Jarek Wosik

Appl. Phys. Lett. 100, 063701 (2012); http://dx.doi.org/10.1063/1.3683477 (4 pages)

Online Publication Date: 7 February 2012

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We report on investigations of nonlinear radiofrequency responses of electrolytes with Na+ and Cl− ions placed within gold electrodes of a capacitor. The sample was part of a frequency-adjustable inductance-capacitance-resistance (LCR) parallel resonant circuit, and measurements were carried out using the two frequencies intermodulation distortion technique. We employed double layer model to analyze the observed nonlinearities and their dependence on ionic concentration. Electrode-electrolyte interface polarization was found to be a predominant cause of this intrinsic nonlinearity and to be dependent on electrolytic ion concentration. We also measured and calculated coefficients of resistive and capacitive components of the observed nonlinearity.
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82.45.Gj Electrolytes

Surface plasmon resonance-enabled antibacterial digital versatile discs

Xuan Dou, Pei-Yu Chung, Peng Jiang, and Jianli Dai

Appl. Phys. Lett. 100, 063702 (2012); http://dx.doi.org/10.1063/1.3685460 (4 pages) | Cited 1 time

Online Publication Date: 9 February 2012

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We report the achievement of effective sterilization of exemplary bacteria including Escherichia coli and Geobacillus stearothermophilus spores on a digital versatile disc (DVD). The spiral arrangement of aluminum-covered pits generates strong surface plasmon resonance (SPR) absorption of near-infrared light, leading to high surface temperature that could even damage the DVD plastics. Localized protein denaturation and high sterilization efficiency have been demonstrated by using a fluorescence microscope and cell cultures. Numerical simulations have also been conducted to model the SPR properties and the surface temperature distribution of DVDs under laser illumination. The theoretical predictions agree reasonably well with the experimental results.
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42.79.Vb Optical storage systems, optical disks
87.17.-d Cell processes
87.15.-v Biomolecules: structure and physical properties

Cellular and molecular responses of Neurospora crassa to non-thermal plasma at atmospheric pressure

Gyungsoon Park, Young H. Ryu, Young J. Hong, Eun H. Choi, and Han S. Uhm

Appl. Phys. Lett. 100, 063703 (2012); http://dx.doi.org/10.1063/1.3684632 (4 pages) | Cited 1 time

Online Publication Date: 9 February 2012

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Filamentous fungi have been rarely explored in terms of plasma treatments. This letter presents the cellular and molecular responses of the filamentous fungus Neurospora crassa to an argon plasma jet at atmospheric pressure. The viability and cell morphology of N. crassa spores exposed to plasma were both significantly reduced depending on the exposure time when treated in water. The intracellular genomic DNA content was dramatically reduced in fungal tissues after a plasma treatment and the transcription factor tah-3 was found to be required for fungal tolerance to a harsh plasma environment.
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87.53.-j Effects of ionizing radiation on biological systems
87.85.Ox Biomedical instrumentation and transducers, including micro-electro-mechanical systems (MEMS)
87.16.-b Subcellular structure and processes
87.14.gk DNA
52.75.-d Plasma devices
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